If you have run out of storage space for video lectures, you will need to clear up storage space on your personal device.
Alternatively, you can control when video downloads delete. On the 'Account' menu, there is an option to 'Remove video after watching' toggle. It will appear blue when you turn it on.
There is an option to select a percentage completion when the app recognizes to delete the video (ranging from 40% completion to 100%) under 'Other.' In order to have the deletion complete, users should log out from the 'Account' menu and then log back in.